Set up example project. #12

An example project should be added to the repo.

This example project should have to purposes:

1. As a demo app for what the packages have to offer, it gives a clear indication on how to use them.
2. As a demo app to test the packages, it can offer a way for users to test the packages as well as test Angular or package version bumps.

An Angular demo app already exists in our Private Gitlab and could be used as a basis:
https://gitlab.com/studiohyperdrive/projects/intern/workshops/shd-angular-demo